From a93b9599d6e342f8fd588022ca14336465f7ff7c Mon Sep 17 00:00:00 2001
From: Frederick Muriuki Muriithi
Date: Fri, 10 Feb 2023 14:07:41 +0300
Subject: Return empty tuple rather than Nothing

When user has no roles assigned, return an empty tuple rather than
pymonad.maybe.Nothing to ease maintenance.
---
 gn3/auth/authorisation/roles/models.py | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

(limited to 'gn3/auth/authorisation/roles/models.py')

diff --git a/gn3/auth/authorisation/roles/models.py b/gn3/auth/authorisation/roles/models.py
index 26b8f0a..bb7ea73 100644
--- a/gn3/auth/authorisation/roles/models.py
+++ b/gn3/auth/authorisation/roles/models.py
@@ -3,7 +3,6 @@ from uuid import UUID, uuid4
 from functools import reduce
 from typing import Any, Sequence, Iterable, NamedTuple
 
-from pymonad.maybe import Just, Maybe, Nothing
 from pymonad.either import Left, Right, Either
 
 from gn3.auth import db
@@ -80,7 +79,7 @@ def __organise_privileges__(roles_dict, privilege_row):
                        privilege_row["privilege_description"]),))
     }
 
-def user_roles(conn: db.DbConnection, user: User) -> Maybe[Sequence[Role]]:
+def user_roles(conn: db.DbConnection, user: User) -> Sequence[Role]:
     """Retrieve non-resource roles assigned to the user."""
     with db.cursor(conn) as cursor:
         cursor.execute(
@@ -90,11 +89,9 @@ def user_roles(conn: db.DbConnection, user: User) -> Maybe[Sequence[Role]]:
             "ON rp.privilege_id=p.privilege_id WHERE ur.user_id=?",
             (str(user.user_id),))
 
-        results = cursor.fetchall()
-        if results:
-            return Just(tuple(
-                reduce(__organise_privileges__, results, {}).values()))
-        return Nothing
+        return tuple(
+            reduce(__organise_privileges__, cursor.fetchall(), {}).values())
+    return tuple()
 
 def user_role(conn: db.DbConnection, user: User, role_id: UUID) -> Either:
     """Retrieve a specific non-resource role assigned to the user."""
-- 
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